Power-saving communication method and apparatus for accessing cellular networks
A communication method and apparatus is provided. The method includes: camping on a first cell by a terminal device. The method further includes: determining, by the terminal device, to access a second cell in response to: receiving a paging message from the first cell, determining that there is to-be-transmitted uplink information, or determining that there is a to-be-transmitted non-multicast service. A frequency of the first cell is different from a frequency of the second cell. The terminal device may not perform uplink transmission or may receive only a multicast service in the first cell so that energy consumption of cell measurement and beam selection is reduced. In addition, resource utilization of a communication system can be improved through flexible deployment.
1 . A communication method, comprising:
camping, by a terminal device, on a first cell;
determining, by the terminal device, to access a second cell in response to receiving a paging message from the first cell, in response to determining that there is to-be-transmitted uplink information, or in response to determining that there is a to-be-transmitted non-multicast service, wherein a frequency of the first cell is a first frequency and a frequency of the second cell is a second frequency; and wherein the first cell and the second cell meet the following: the first frequency is lower than the second frequency; and a quantity of beams of the first cell is less than a quantity of beams of the second cell;
changing a serving cell to the first cell through cell selection, cell reselection, or handover, wherein the serving cell of the terminal device is a third cell and a frequency of the third cell is different from the first frequency, including:
receiving a first message from a network device, wherein the first message indicates that the first frequency is a frequency in an energy-saving mode;
determining, based on at least one of an energy-saving mode of the terminal device, a service activity degree of the terminal device, power of the terminal device, and an access delay of the terminal device to change the serving cell to the first cell; and
measuring the first frequency and changing the serving cell to the first cell.
2 . The method according to claim 1 , wherein the first cell and the second cell further meet the following:
coverage of the first cell is greater than coverage of the second cell.
3 . The method according to claim 1 , wherein the first cell does not support uplink transmission or the first cell supports only multicast service transmission.
4 . The method according to claim 1 , wherein the determining to access the second cell comprises at least one of:
determining to access the second cell in response to determining that there is to-be-transmitted uplink information and determining that the first cell does not support uplink transmission;
determining to access the second cell in response to determining that there is to-be-transmitted uplink information and determining that the to-be-transmitted uplink information is a data service; or
determining to access the second cell in response to determining that there is a to-be-transmitted non-multicast service and determining that the first cell supports only multicast service transmission.
5 . The method according to claim 1 , wherein the determining to access the second cell further comprises:
measuring a reference signal of the first cell, and determining to access the second cell in response to a measurement result being less than a first threshold.
6 . The method according to claim 1 , further comprising:
receiving indication information from the network device, wherein the indication information indicates to access the second cell, indicates not to access the first cell, indicates to select a cell based on the second frequency for access, or indicates that a frequency priority of the first frequency is the lowest priority.
7 . The method according to claim 1 , wherein the determining to access the second cell further comprises:
performing cell selection based on the second frequency and choosing to access the second cell; or
lowering a frequency priority of the first frequency to a frequency priority lower than that of the second frequency, triggering a measurement on a cell whose frequency is the second frequency, and reselecting the second cell.
8 . The method according to claim 1 ,
wherein the first message indicates a frequency priority of the first frequency.
9 . A communication method, comprising:
determining, by a first access network device, indication information, wherein the indication information indicates to access a second cell, indicates not to access a first cell, indicates to select a cell based on a second frequency for access, or indicates that a frequency priority of a first frequency is the lowest priority;
sending, by the first access network device, the indication information to a terminal device through the first cell, wherein a frequency of the first cell is the first frequency, a frequency of the second cell is the second frequency, the first cell is a cell of the first access network device, and the second cell is a cell of a second access network device; and wherein the first cell and the second cell meet the following: the first frequency is lower than the second frequency; and a quantity of beams of the first cell is less than a quantity of beams of the second cell;
sending a first message to the terminal device, wherein the first message indicates that the first frequency is a frequency in an energy-saving mode, which enables the terminal device to determine, based on at least one of an energy-saving mode of the terminal device, a service activity degree of the terminal device, power of the terminal device, and an access delay of the terminal device to change a serving cell to the first cell, measures the first frequency and changes the serving cell to the first cell through cell selection, cell reselection, or handover, wherein the serving cell of the terminal device is a third cell and a frequency of the third cell is different from the first frequency.
10 . The method according to claim 9 , wherein the first cell and the second cell further meet the following:
coverage of the first cell is greater than coverage of the second cell.
11 . The method according to claim 9 , wherein the first cell does not support uplink transmission or the first cell supports only multicast service transmission.
12 . The method according to claim 9 , wherein the indication information is carried in a paging message.
13 . The method according to claim 9 ,
wherein the first message indicates the frequency priority of the first frequency.
14 . An apparatus, comprising:
a memory storing instructions; and
at least one processor in communication with the memory, the at least one processor configured, upon execution of the instructions, to implement:
camping on a first cell;
determining to access a second cell in response to receiving a paging message from the first cell, in response to determining that there is to-be-transmitted uplink information, or in response to determining that there is a to-be-transmitted non-multicast service, wherein a frequency of the first cell is a first frequency, and a frequency of the second cell is a second frequency; and wherein the first cell and the second cell meet the following: the first frequency is lower than the second frequency; and a quantity of beams of the first cell is less than a quantity of beams of the second cell;
changing a serving cell to the first cell through cell selection, cell reselection, or handover, wherein the serving cell of a terminal device is a third cell and a frequency of the third cell is different from the first frequency, including:
receiving a first message from a network device, wherein the first message indicates that the first frequency is a frequency in an energy-saving mode;
determining, based on at least one of an energy-saving mode of the terminal device, a service activity degree of the terminal device, power of the terminal device, and an access delay of the terminal device to change the serving cell to the first cell; and
measuring the first frequency and changing the serving cell to the first cell.
15 . The apparatus according to claim 14 , wherein the first cell and the second cell further meet the following:
coverage of the first cell is greater than coverage of the second cell.
16 . The apparatus according to claim 14 , wherein the first cell does not support uplink transmission or the first cell supports only multicast service transmission.
17 . The apparatus according to claim 14 , wherein the determining to access the second cell in response to receiving the paging message from the first cell, in response to determining that there is to-be-transmitted uplink information, or in response to determining that there is a to-be-transmitted non-multicast service comprises at least one of:
determining to access the second cell in response to determining that there is to-be-transmitted uplink information and determining that the first cell does not support uplink transmission;
determining to access the second cell in response to determining that there is to-be-transmitted uplink information and determining that the to-be-transmitted uplink information is a data service; or
determining to access the second cell in response to determining that there is a to-be-transmitted non-multicast service and determining that the first cell supports only multicast service transmission.
18 . The apparatus according to claim 14 , wherein the determining to access the second cell further comprises:
measuring a reference signal of the first cell and determining to access the second cell in response to a measurement result being less than a first threshold.
19 . The apparatus according to claim 14 , wherein the at least one processor is further configured to implement:
receiving indication information from the network device, wherein the indication information indicates to access the second cell, indicates not to access the first cell, indicates to select a cell based on the second frequency for access, or indicates that a frequency priority of the first frequency is the lowest priority.
20 . The apparatus according to claim 14 , wherein the determining to access the second cell further comprises:
performing cell selection based on the second frequency and choosing to access the second cell; or
lowering a frequency priority of the first frequency to a frequency priority lower than that of the second frequency, triggering a measurement on a cell whose frequency is the second frequency, and reselecting the second cell.